Invasion
Invasion Description
Alesund/Norway/Skaggerak (1902, Hopkins 2002)
Geographic Extent
"entire coastline/Norway/Skagerrak (1902, Hopkins 2002); Verdens Ende/Norway/Oslofjord (1992, Bjærke and Fredriksen 2005, epiphytic on Sargassum muticum); Sweden/Skagerrak
Vectors
| Level | Vector |
|---|---|
| Probable | Hull Fouling |
Regional Impacts
| Ecological Impact | Food/Prey | |
| Bonnemaisonia hamifera produces a chemical compound (1,1,3,3-tetrabromo-2-heptanone), not present in competing algae, which discourages herbivory by native mollusks, isopods, and amphipods, in waters around Tjarno, Sweden, in the Skagerrak (Enge et al. 2012). | ||
| Ecological Impact | Habitat Change | |
Bonnemaisonia hamifera, because of its chemically-based resistance to herbivory, provides a refuge for herbivores (e.g., the isopod Idotea granulosa) (Enge et al. 2013). | ||
| Ecological Impact | Competition | |
In experiments, Bonnemaisonia hamifera outcompeted native seaweeds, because of its chemical defenses against herbivory (Enge et al. 2013). One of its defensive compounds (1,1,3,3-tetrabromo-2-heptanone) inhibits the settlement of propagules of several native seaweeds and of microalgae, providing a competitive advantage through allelopathy (Svensson et al. 2013). | ||
| Ecological Impact | Toxic | |
Bonnemaisonia hamifera produces a chemical compound (1,1,3,3-tetrabromo-2-heptanone), not present in competing algae, which discourages herbivory by native mollusks, isopods, and amphipods, in waters around Tjarno, Sweden, in the Skagerrak (Enge et al. 2012). | ||